2 series -- it is also the most direct replacement for the discontinued Z v. 3 series but at a much lower price. They use the same voice coil as the X v.2 series; therefore RMS power is 1500-watts rated conservatively. The motor is a similar design to the X v. 2 series with one less magnet slug since it isn't needed for use on these frames & soft parts. It also retains a magnet ID shorting ring just like the X v. I have tooled 4 new cone bodies & surrounds to mate up to an entirely different frame tooling from the 1st prototypes. These surrounds are based on the Z v. 3 18 surround geometry as this has been our go-to cone for SPL (we use those cones in our Terra for our World Record in SS 3-4 class). We also have tooled the cones to support the same wide-flange dust caps we use on all the new platform drivers.
They also feature custom tooled cast aluminum vent spacers to mate up correctly to these frames. We tooled 2 different spacers for this line. Another new feature (also fully custom tooled) is the cast aluminum surround bolt-on ring.
We tooled one for each size U series. These woofers will have a similar sound to the Z v. 3 series -- meaning they do not have the "new platform" sound of the X, Z, NS, etc.
DC Resistance (Re): 6.1. Resonance Frequency (Fs): 31.4 Hz. Equivalent Volume (Vas): 135.4 L. Electrical Q Factor (Qes): 0.42.Mechanical Q Factor (Qms): 3.55. Total Q Factor (Qts): 0.38.
Voice Coil Inductance (Le): 3.97 mH. Force Factor (BL): 35.3 NA. Air Load (Mms): 441.3 g. Suspension Compliance (Cms): 0.06 mm/N.Sensitivity: 91.8 dB 1w / 1m. Outside Diameter: 18.66 in. Cutout Diameter: 16.69 in. Recommended Port Area: 64 sq. In order to maintain an inventory of 100%, Brand New, A-Stock, untouched products, all sales are final. We ask that you please be sure you are ordering the correct product. The item "SUNDOWN AUDIO U-18 D2 18 SUB 1500W RMS DUAL 2-OHM SUBWOOFER BASS SPEAKER NEW" is in sale since Tuesday, July 6, 2021. This item is in the category "Consumer Electronics\Vehicle Electronics & GPS\Car Audio\Car Subwoofers". The seller is "woofersetc_outlet" and is located in Los Angeles, California. This item can be shipped worldwide.